<https://www.hilase.cz/en/publications/cryogenically-cooled-ybygag-ceramic-picosecond-oscillator/>
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<https://www.hilase.cz/en/publications/cryogenically-cooled-ybygag-ceramic-picosecond-oscillator/#breadcrumb>
<https://www.hilase.cz/en/publications/cryogenically-cooled-ybygag-ceramic-picosecond-oscillator/>